no its not the same movement...it isnt natural......when you do a regular squat, there is more of an arching movement......with smith machine, all you have to do is get under and push with all your mite......
regarding pins statement, of course you'll still work your legs....but you're not working them as well as you could with squats..you're pretty much only doing quads...you might as well just do legs press as that would be more effective than smith machine squats.....you'll be using a lot more muscles from free weight squats. A lot more lower back and abs......squats can greatly improve posture. also, if there is nothing wrong with smith machine...why not do smith machine for all your lifts.......deadlift, bench, etc??? absolutely nothing can take the place of regular free weight squats....it is impossible. if you're using smith machine and its working for you, keep it up, but remember that you can be gaining a lot more from the free weight ones......also pin you got 28+ inch legs from this....for someone your height and the number of cycles you've done, i'd hope they're 28+ even from not doing squats.....just my opinion